From e3da84bcc30ad67d2a411ef33634a8926e505280 Mon Sep 17 00:00:00 2001
From: Amjad Masad <amjad.masad@gmail.com>
Date: Thu, 3 Dec 2015 23:58:25 -0800
Subject: [PATCH] Add support for null literal type

---
 src/plugins/flow.js                           |   5 +
 .../flow/literal-types/null/actual.js         |   1 +
 .../flow/literal-types/null/expected.js       | 114 ++++++++++++++++++
 3 files changed, 120 insertions(+)
 create mode 100644 test/fixtures/flow/literal-types/null/actual.js
 create mode 100644 test/fixtures/flow/literal-types/null/expected.js

diff --git a/src/plugins/flow.js b/src/plugins/flow.js
index 060f623649..7e561ac56d 100644
--- a/src/plugins/flow.js
+++ b/src/plugins/flow.js
@@ -514,6 +514,11 @@ pp.flowParsePrimaryType = function () {
       this.next();
       return this.finishNode(node, "NumericLiteralTypeAnnotation");
 
+    case tt._null:
+      node.value = this.match(tt._null);
+      this.next();
+      return this.finishNode(node, "NullLiteralTypeAnnotation");
+
     default:
       if (this.state.type.keyword === "typeof") {
         return this.flowParseTypeofType();
diff --git a/test/fixtures/flow/literal-types/null/actual.js b/test/fixtures/flow/literal-types/null/actual.js
new file mode 100644
index 0000000000..8595ff5eeb
--- /dev/null
+++ b/test/fixtures/flow/literal-types/null/actual.js
@@ -0,0 +1 @@
+var foo: null
diff --git a/test/fixtures/flow/literal-types/null/expected.js b/test/fixtures/flow/literal-types/null/expected.js
new file mode 100644
index 0000000000..78ebec7ba0
--- /dev/null
+++ b/test/fixtures/flow/literal-types/null/expected.js
@@ -0,0 +1,114 @@
+{
+  "type": "File",
+  "start": 0,
+  "end": 13,
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 13
+    }
+  },
+  "program": {
+    "type": "Program",
+    "start": 0,
+    "end": 13,
+    "loc": {
+      "start": {
+        "line": 1,
+        "column": 0
+      },
+      "end": {
+        "line": 1,
+        "column": 13
+      }
+    },
+    "sourceType": "module",
+    "body": [
+      {
+        "type": "VariableDeclaration",
+        "start": 0,
+        "end": 13,
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 13
+          }
+        },
+        "declarations": [
+          {
+            "type": "VariableDeclarator",
+            "start": 4,
+            "end": 13,
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 13
+              }
+            },
+            "id": {
+              "type": "Identifier",
+              "start": 4,
+              "end": 13,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 13
+                }
+              },
+              "name": "foo",
+              "typeAnnotation": {
+                "type": "TypeAnnotation",
+                "start": 7,
+                "end": 13,
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 7
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 13
+                  }
+                },
+                "typeAnnotation": {
+                  "type": "NullLiteralTypeAnnotation",
+                  "start": 9,
+                  "end": 13,
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 9
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 13
+                    }
+                  },
+                  "value": true
+                }
+              }
+            },
+            "init": null
+          }
+        ],
+        "kind": "var"
+      }
+    ]
+  }
+}